Amauter and NO BRAIN JUST *****S

I have contract with Zone Fitness with the premium of R185.00 monthly I December a debut order return and in January around the 08th they deducted R250.00 instant of R185.00.I called and went to their premises in Campus Square several time to get clarity. The answer was the extra amount of for bank charges I advised they that yes according t the contract I singed I ma liable to bank charged and will to pay the fees. I also advised them what they are doing is ******* since they are service provide not the bank. till today no one can give me the answer to that